<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>向 set 中添加多个元素</title>
</head>
<body>
    
</body>
</html>
<script>
    var set = new Set();
    set.add('hello').add([123]);
    console.log(set);
</script>